Method of and mechanism for conditioning starch



Aug. 16, 1932. H.W. HARRIGAN 1,872,284

METHOD OF AND MECHANISM FOR CONDITIONING STARCH Filed April 4, 1931 4Sheets-Sheet l Aug. 16,1932. H. w. HARRIG N" I 1,872,284

METHOD OF AND MECHANISM FOR CONDITIONING STARCH Filed April 4. 1951 4Sheets-Sheet 2 Aug. 16, 1932. H. w. HARRlG-AN 1,872,284

I 1 METHOD OF AND MECHANISM FOR CONDITIONING STARCH 4 Sheets-Shet 3Filed April 4, 1931 @0012?- Jfmwia? 714% wwww 422w.

at A86 0 Aug. 16, 1932. HJWQHARRIGAN N ,2

METHOD OF AND MECHANISM FOR CONDITIONING STARCH Filed April 4/ 1951 4Sheets-Sheet 4 n g, 7 1,77 5;; bfl\ {R I mil \Fj" Fly/ 1 1 4 W I. w ,1 YHf J w W W EM Patented Aug. 16, 1932 HAROLD w. mnIoaN, or

IACTURING COMPANY onusa'r'rs k mannosn, imssacnusa'rrs; ASSIGNOR 'ronmzsmr mun-i or nos'roN, massacnosmrs, a ooRroaA'IIoN or MASBA-I fixmnono1 aNnmncnLNIsu son CONDITIONING s'rmcn 1 Application filed April 4,1931. Serial No. 527,698

In my Patent No. 1,693,649 granted December 4, 1928, is shown and descrbed a method of and a mechanism for taking starch from a candy moldingmachine orbuck, after eration during which the starch V u tionsparticularly adapted to the manufaca molding op I absorbs moisture, andso treating it as to bring it' to the desired conditions of moisturecontent and temperature for subsequent use in the molding machine.Suchcond1- 1o tioning mechanism may include a drier for the starch,means the desired temperature-,and means-for separating out from thestarch foreign matter which may have mingled therewithzdurmg 16 handlingin molding. In "that patent is shown and described also, chronizedcontrol of the other various mechanisms from the molding machine, theoperation of-which is not continuous.

$9 One of the'objects of the present invention is to provide anautomatic control of the other mechanisms -more suited to therequirements of practice than is the synchronized control disclosedinthe' patent; When startingthe moldingmachine, various adjustments areusually found necessary, which I require that the machine belstopped forshort intervals .untilthey have been made to the satisfaction of theoperator, after which the machine is permitted to "run for a more-ex-.

tended period. It is neither necessarynor desirable, however, to stopand startthe .drier or other starch conditioning mechanisms whenever themolding machine is stopped I justments. Accordingto the presentinvention. therefore, meansare provided for introducing a lag in thecontrolof the drier or other conditioning mechanisms from the moldingmachine. Theconditioning mechanisms will not then be put into operationuntil the molding machine has been in continuous operation"for 'apredetermined period. say, two minutes, so that reasonably continuousoperation of the molding machine for a considerable period' may beexpected. Likewise when the molding machine. is stopped the conditioningmechanisms continue to operate for a period, say, two minute's, at theend of which time they also stop,

for bringing the starch to an automatic synand startedduring this periodof initial ad-- provided that the molding machine has not I again beenstarted duringthat'period, v

This'invention also relatesto improvements inthe cycleof operationsmaking for greater .efiiciency, and to certain modificature of candy ofthe types" known in the trade as gums or jellies. l i

For a more complete understanding of this invention, referencesmay behad to the accompanying drawings in which Figure 1 is a diagrammaticviewof mechanism particularly suitable for conditioning starch for use inthe molding of marshmallows or creams. V j' Figure 2 is a view similarto Figure 1 but showing a. mechanism particularlysuitable forconditioningstarch for use in the molding of gums or jellies. 7 Q 1Figure 3 is a vertical ,sectionthrough a conditioning mechanism controldevice showing the parts in the {positions taken when the buck ormolding machine' has just been starteda I Figures 4 and fiare' sectionson lines 4 -4 and 5-5, respectively, oflFigure' 3.

Figures 6 tol9 inclusive are perspectives of certain of the partsofthecontrol device. Figures 10 to 13 inclusive are sectional detailsshowing different positions of the switch operating elements of thecontrol device.

Figure 14. is a diagram of the mechanism. Figure. 15 is a'diagramshowing a modification. I

' Referring first to Figure 1, at 1 is indicated a starch moldingmachine such. as is known commercially inth'e art as a buck or mogul.The starch in this machine is made into molds into which the candy stockin fluent condition is poured and allowed to set. After the setting hasbeen effected the molded candies are removed. The starch during themolding operation takes up moisture from the candy and thus isnotthereafter' in condition for immediate re-use. As shown in Figurel'this moist starch is taken up by an elevating conveyor, indicateddiagrammatically at 2, and discharged at the upper'end of the conveyorinto a pipe 3 which leads to a drier 4. This dried as shown comprises a.downi trols the diaphra m steam valve 12. Air is drawn through 1: e drumin countercurrent the shaft 5 having a pinion 6 thereon meshing with anannular gear 7 secured to the drum. At 8 are roller supports adjacent tothe opposite ends of the drum which facilitates the rotation thereof. Atthe lower end of the drum is shown diagrammatically an air heater 10provided withsteam coils, the steam supply thereto being regulated tothe desired temperature as by an automatic temperatur regulating deviceat 11, which conflow to the starch as by means of a fan at 13 shown asdriven by belt connection 1414a from a counter shaft 15. The air isdrawn by the fan through a pipe 16 to and through a dust separator 17which separates the starch which has been carried thereby from the air,the starch passing down through the hopper 18 into the pipe 3 and thusbeing returned to the upper end of the drier drum 4 while the air ispermitted to escape as through the discharge pipe 13a.

After passing out at the lower end of the drier drum, the starch, nowdried to the desired moisture content, passes through a pipe 20 past anair damper 19, which prevents the fan 13 from drawing air from thecleaner rather than through the heater. 10, into a cleaner 21. Thiscleaner may be of any suitable'type, but as herein shown is providedwith a rotary screen 22 through which the starch passes, the starchpassing through the screen into a hopper 23 from which it is conveyed bythe rotary conveyor at 24 to the upper end of a downwardly inclinedcooler 25. The starch being relatively dry when screened, the foreignmatter is more easily freed therefrom than when it is moist in whichcondition it is more sticky.

The screen drum is rotated as by belt connect-ion with the counter shaft15, and the conveyor 24 may be driven by the belt 26 which also derivesits motion from the counter shaft 15 through the intermediate shaft 21which is coupled to the rotary screen shaft. The cooler 25 may be of anysuitable type such as is shown in my patent hereinbefore mentioned,cooling liquid being passed therethrough as through the pipe 30, andbeing controlled in amount by the thermometer 31 in the starch returnpipe 32 through the automatic temperature control mechanism at 33 whichcontrols the cooling liquid supply valve 34. These parts may be soadjusted as to cause the starch passing through the pipe 32 to bereturned to the molding machine 1. cleaned and properly conditioned forimmediate re-use both as to its moisture content and temperature. Whenreturned in cooled condition it is suitable for use in the molding ofmarshmallows.

The cooler may be driven from the counter shaft 15 as through the beltconnection 36.

counter shaft 15 is driven by a motor through a belt 41 and, as will belater more fully described, this'motor is automatically controlled inaccordance with the operationof the molding machine 1.

When the starch is to be used in the manufacture of candies such as gumsand pastes the starch should be delivered to the molding machine in hotcondition but relatively dry. Where this is desired the arrangement ofmechanism shown in Figure 2 is desirable. The starch is taken from themolding machine 1 by the elevating conveyor 2 and delivered through thepipe at the upper end of the conveyor to the upper end of a preheater 51in which the starch is given an initial heating before it is deliveredthrough the pipe 52 to the upper end of the drier drum 53. Thispreheater 51 may be supplied with steam through a pipe 54 and it may beprovided with ascrew conveyor mechanism for moving the starchtherethrough which is driven from a shaft 55 through the gearedconnections 56 at opposite ends thereof. In order that the starch maynot be heated excessively, as when the conveyor is stopped, the supplyof steam may be regulated through a governor controlled valve 57 gearedas at 58 to the shaft 55. With this construction, when the shaft 55 isnot rotating, the valve 57 is closed and when the shaft 55 is rotatingand the conveyor is in operation, the valve is open to permit the steamto pass through the preheater. 60 for the drier is positioned at theentry end thereof so that the air and starch pass in the same directionthrough the drier. The starch being preheated but containing itsmoisture, the air from the heater 60 coming in contact therewith causesa rapid drying of the starch to the desired degree while maintaining itstemperature relatively high. Air is drawn through the heater 60 and thedrum 53 through a pipe 66 and to and through the dust separator 67 as bythe fan at 65. The

starch passes from the dust separator 67 through a chute 68 to thepreheater 51 while the air is allowed to escape. A valve 69 at the lowerend of the hopper 68 prevents the passage of air from the dust collectorinto the preheater 51. The supply of steam to the air heater 60 may becontrolled by a thermometer 70, which through the automatic control 71controls the diaphragm steam supply valve 72. The starch which has beenheated and dried is then passed through a pipe 75 to the cleaner 76, avalve 77 being provided in the pipe 75 to prevent air being It will benoted also that the heater drawn up from the cleaner by the fan 65, thisvalve opening, however, to permit the passage of the starch to thecleaner. This cleaner may be of the rotary screen type, as is a shaft 78connected counter shaft 80. This counter shaft also v drives theconveyor 2 through the belt 84,

. a shaft 85, belt 86, shaft 87, and gearing 88. The counter shaft. isdriven by the motor 40 through the belt 82. The shaft 56 is also drivenbythe motor 40, being connected by the belt tothe shaft 78.- Thefan 65is 0 belt driven from the; shaft 87. The starch. assingthrough thecleaner 76 falls into the opper fromwhich it is delivered tothe 1' 96which carries it to the molding conveyor mach ne 1., The conveyor 96maybe-driven from the motor 40 as-through its beltconnec- 40 whichdrives the;drier' and the various other starch conditioning mechanismscorresponds to the motor 40 shown in Figure 1, which drives the drierand the starch condi tioning mechanisms 'shownin that Figure.

isthe usual drive for machines of this charpulleys as 104, to the f tooppositely These motors 40, in either of the arrange mentsshown, may becontrolled automatically throu h the operation of the starch molding macine as by mechanisms shown in detall 1n Figures 3 to 15. The starchmolding machine is operated by a motor 100, shown diagrammatically inFigures 14 and 15, and interposed between this motor 100 and theoperative mechanisms is a clutch of any suitable descri tionwhich isclutched or unclutched by axial motion of a shift bar 102. This actorand hence has notb een illustrated. in detail. In the mechanism shown inFigures 1 to 14"this clutch-bar 102 has fixed thereto a cable 103 whichpasses about suitable upper face of a casing 105, opposite ends of thiscable extending down into the casing 105 and being attached disposed'cambars 110. Springs 106, are interposed in the cable 103 between ith'sitel OPPQ y the clutch bar 102 and the cam bars 110.

These cam bars are alike so that a description of one will besuflicientlfor both.

' Each cam bar is mounted in a vertical guide member 111, shown detachedin Figure 6, and is provided,

as shown best in Figure 7 disposed side flanges 112,

each having a forwardlyprojecting intermediate portion 113 which ridesin guide slots 114 through inwardly turned forward wall members 115 ofthe guide 111. The member 110 is of less thickness than the guideway 116within the member 111 and is normaly pressed forwardly with its flanges112 riding against the rear faces of the walls 115 as by means of aleafspring 120 (see Figures '10 and 13) It is normally pulled downwardlywithin its guide member as by means of a coil spring fixed at oppositeendsof the base of the member 111 and the lower end of the cam two cambars hold the cable 103 in taut condition but by shifting the clutch rod102 axshaft 131 supports member 110. The two springs 121 for the.

portion 125 and supporting feet 126 by which it is secured at oppositeends ofthe'web portion to the base of the casin 105. Remote from theguide portion llltiie web .125 has upstanding 7 between the forkedportions ofwhich is pivin which is journaled one end portion of a shaft131. Adjacentto its opposite end this ,backof the flanges 115 of thebearinggost 111 and, between the flanges 112 of the ar 110.

a bearing 132 provided with a journal opening 133 (see Figure 8) intion'97 to thecleaner shaft 98; Y The motor y shown detached in Figure9. This slide 135 therefrom aforked bearing 128 otally mounted at 129 abearing sleeve 130 The block is provided on its rear face v wit-ha latchlug .140 which may be engaged in a slot141 in the forward face of themember110. This slot 141 has a shoulder 142 at its lower end-whichengages the latch lug so that when the 'member110 is in its forwardposition, as it israised by the pull of the cable 103 thereon, itsshoulder 142 engages the lug 140 onthe block135 and raises the-shaftbearing 132. Thisbrin s a grooved friction pulley 145 fixed to the s aft131 adjacent to the bearing 132 into driven relation with a conicalpulley 146 on a counter shaft 147. Two of these conical pulleys 146 areemployed. one for each of the grooved pulleys 145. The shaft 147 isdriven through su1t able reduction gearing including the bevel gears 148and the worm and worm wheel drive 149 from-a shaft 150 of a small motor151 which acts as. a timing motor. This reduction gearing and therelative sizes of the friction pulleys 146 and 145 are so designed thatwhen either of the friction pulleys 145 is drawn up into engagement withthe pulleys 146 and the motor 151 is running, the shaft 131 carrying thefriction pulley 145 which is being driven, turnsthrough a predeterminedangularvdistance during the desired time of delay between the startingof the molding machine and the'starting of the starch conditioningmechanism, or between the stopping of the molding machine and stoppingof the conditioning'mechanisms.

spacing of the projecting ortions 113 of the cam piece so that w en theshaft 131 has been turned a predetermined angular amount depending onthe angular setting of the sleeve 157 and its cams 155 and 156, thesehumps 161 engage the projecting portions 113, push the member 110rearwardly and release the latch lug 140, as shown in Figure 11,permitting the slide and the friction pulley to drop so that thefriction pulley 1s brought out of contact with its driving pulley 146,as shown at the right hand side of Figure 3. As soon as the pulley 145is out of driven relation to its pulley 146, a weight 165 attached to acord 166 which is wound around a drum 167 fixed to the shaft 130, causesthe shaft 131 to be turned backwardly to its starting position so thatwhen the pulley is again brought up into contact with the drivlngfriction pulley 146 it will be rotated through the predetermined angulardistance before the engagement between the driving pulley is againreleased by the action of the cam humps 161. If before this time haselapsed, the operator should throw the clutch rod 102 in a direction topermit the lowering of the member 110, the pulley 145 immediately dropsout of engagement with its driving pulley 146 and the weight 165 returnsthe pulley 145 to its initial angular position. Each time the pulley ismoved up into contact with its driving pulley 146, therefore, the timenecessary for the shaft 131 to be turned the full predetermined angulardis tance must elapse before the pulley is automatically released. Justbefore the pulley releases automatically its rotation actuates either ofa pair of switches 170 both together controlling the motor 40, either tostart this motor 40 when the clutch rod 102 has previously been thrownto clutching position, or to stop the motor, if this clutch has beenthrown to stop the operation of the molding machine. These switches 170, as shown, are of the push button type, each being provided with anactuating push button 172 which being depressed throws the switch arm175 or 175a. Arm 175 in Figure 14 designates the switch arm of one ofthe switches 170 and 175a designates the switch arm of the other switch17 0 and depression of the push button brings the corresponding switcharm alternately into contact with either of a pair of contacts such as176, 177 and 17 6a, respectively. The switch button is shown as actuatedby a cam disk 178 which may be formed integral with the drum 167. Thiscam drum 17 8 is circular for the major portion of its outline, theremainder of this outline being formed as a rise 179 and a drop 180. Asthe shaft 131 nears the release angular position when being driven bythe motor 151, the rise 179 of the cam 178 engages the push button 172and depresses it so that the switch 17 0 is thrown just before the drop180 of the cam is reached,

[after which the friction pulley 145 is automatically caused to dropaway from its driving pulley 146 and the cam 178 is returned to itsinitial position by the action of the weight 165 as before described. Itwill thus be seen that neither switch 170 can be actuated until a-shaft131 has been raised to hold its friction wheel 145 in continuous contactwith its driving pulley 146 for a predetermined period, and if beforethe completion of this period, the shift rod 102 is moved to release thefrictional driving engagement, the shaft returns to its initial positionso that the switch is not operated and an additional complete period isagain necessary when the shift lever has been moved to its formerposition before the switch is operated. Thus a continuous operation ofthe molding machine for a definite period is necessary before the starchconditioning mechanisms are thrown into operation, and stopping of themolding machine short of this period, returns the control parts toinitial position so that the time already taken is not efl'ective whenthe molding machine is again put in operation. Llkewise the stopping ofthe conditioning mechanism may be produced only after the moldingmachine has been continuously idle for a predetermined period. In actualpractice a lag or time interval of about two minutes is found suflicientin both starting and stopping.

In Figure 14 a wiring diagram of connections is shown by which themechanism just described may be employed to accomplish this desiredcontrol. At 200 and 201 are shown line wires from a suitable powersource and at 202 is a main switch for controlling the operation of themolding machine motor 100. In series with this motor is one coil 203 ofa relay 204. This relay when closed by the energization of the coil 203closes a connection through the timing motor 151 between the power lines200 and 201 so that as soon as the motor 100 for the molding ma chine isenergized the timing motor 151 is set into operation. The motor 40 whichdrives the conditioning mechanism is' arranged in series with the relaycoils 205 of the relay 204 so that whenever this motor 40 is energizedthe relay is closed and the timing motor 151 is energized. Thus eventhough the main switch 202 should be opened to stop the molding machinewhile the motor 40 is in operation, the timing motor 151 remains inoperation so that at the proper time the motor 40 is stopped whereuponthe timing motor also stops. In the condition shown in full lines inFigure 14. the motor 40 is stopped.

Assuming now that the switch 202 be closed so as to energize the motor101 and the clutch bar 102 be thrown to the. right as viewed in Figure 3to start the operation of the molding machine. This pulls upwardly onthe left hand cam bar 110 and raises the left hand jc1rcuit from theline switch; arm175, 'conta the line .wi're 200 so mat s motor-"40 shaft131 so as to bring its friction pulley 145 into driving relation to itsdrive pulley 146. If the rod 102 is left in this position at the end ofthe desired time 1ag,sa tw o minutes, the lefthand switch 170 is'actuatedtomove its arm 17 Mo engage the contact 17 7 as shown b dottedlines in Figure 11-. This-closesthe' wire switch arm 175, relay coil 205and thejmotor isenergized and the conditioning'mechanisms "areput intooperation. If at any time prior time for the switch arm 17 5 to bethrown, t e clutch rod 102'should have been thrown to disconnect themotor 100 -from the molding machine, the pulley 145 would to the fulldelay have been released from its *driving pulleydrawn up withits 7 therequired time to, complete the necessary a and returned the full timedelay 40. If now after the motor 40 has been started,'1

the shift'bar 102 bemoved to the left to stop "the operation of themolding mechanism, the

right hand shaft 131 shown in Figure 3 is,

angular motionof the shaft 131, the switch arm 17 5a is thrown away fromthe contact 177a and into engagement with the'contact" thus breaking thecircuitto the motor 40'and'causing this motor to stop. If now the shiftrod 102 be actuated to again start,

the molding machine, after the desired timeof continuous operation ofthe moldingfmachine, the switch arm 175 is thrown out of en- I i to stopthe motor 40. If now the molding ma chine is again stopped, after agagement with the of the cable 103 with the shift bar 102, an electricalconnection is employed;' 'Inthis gagement with the contact 177 land intoencontact 17 6, whereupon connections are again re-established through"the motor vengagement with the contact 176a as it was' 40, the switcharm 175a being in on the preceding throw of this arm 175a continuousidle period of the desired duration, the switch arm 175a is moved out ofengagement with the contact 176a whereupon the circuit to the motor 40isinterrupted.

InFigure 15 amodification is shown, in

which, instead of the mechanical connection constructionthe shift rod102 is provided with a switch throwing element 210 which acts on aswitch lever 211 so that when the rod 102 is in clutching position ithas actuated the switch arm211 to close connection between the line wire200 and a terminal 212" arranged in series with a solenoid 213 whichwhen energized pulls the right hand cam bar 110 shown in Figure 3 upwardin the same' manner that it is pulled mechanicallyby the 201 through thect l7'l,'contact 177a,

to bring its pulley 145 into contact} driving pulley 146, whereuponafter;

vperiod and for cable mechanism shown in Figure 3. When the clutch bar102 is thrown to the left, the arm 211 is thrown in the oppositedirection into engagementwith a'contact 214 in series with'a solenoid215, the energizationof which "raises the left 'handcam bar'110.-- Inother respects this mechanism is the same as that shown in Figure 14.

From thedescription of certain embodiments of the invention hereinbeforegiven, it

will'be evident to'those skilled in the art that various othermodifications and changes might be made without departing from Incombination with amachine for thespirit or scope of this inventionias itis de' finedin the appended claims.- 0 4 l claimr molding. starch, meansforreconditioning starchfrom said machine for subsequent use,

and means for starting said conditioning means only after a predtermined time of contmuousoperation of said machine.-

*- 2. combinationwith a machine for molding starch, means forreconditioning starch from said machine for subsequentuse, and means forstoppingthe operation of said conditioningmeans only after apredetermined time of continuous idleness of said' machine.

3. In combination with a machine for molding; starch, means forreconditioning starch from said machinefor subsequent use,

and means for starting and stopping said.

conditioning meansonly after a predeterm ned time of contmuous operationand of contmuous idleness, respectively, of said machine, a

4. I [n combination with a machine for 'moldmg starch, means for dryingthe starch after use in; said machine and for delivering the driedstarchat a desired temperature to said machine,fland control mechanism forautoma'tically Startin the operation of said means only g aftejr saimachine has been in continuous operation for a predetermined {51 -111combination; with a machine for 'inolding starch,m'eans 'for 'drying thestarch "afte'rin said machine andjfor delivering the driedstarch atadesired temperature to said machine, and control mechanism forautomatically stopp ng" the operation of said means only after saidmachinehas been continuously idle for a predetermined'period;

6. In combination with a I machine for molding starch, means for d" ingthestarch 'after use in said machine, fan for delivering j the driedstarch at a desired temperature to said machine, 1 and control mechanismfor automatically starting the operating of said means only afterrsaidmachine has been in continuous operation for a predetermined stoppingthe operation of said means onl after said machine has been continuouslyi e for a predetermined period,

7. The combination with a starch molding machine, of means including adrier for reconditioning starch used by said machine for re-use therein,control means for starting and stopping said machine, control means forstarting and stopping said drier, a timing mechanism set into operationby thestartin of said machine when said drier is stoppe and by thestopping of said machine when said drier is in operation, means actuatedby said mechanism for actuating said drier control means to start saiddrier only after a predetermined time of continuous o eration of saidmachine, and means actua le by said mechanisrr for actuating said driercontrol means to stop said drier only after a predetermined idle periodof said machine.

8. In combination, a machine, a mechanism, a motor for driving saidmachine, a clutch interposed between said, motor an d machine, a motorfor driving said mecha nism, a timing motor, switch means forcontrolling said mechanism motor, means for energizing said timing motorwhenever either said machine motor or said mechanism motor is energized,a device started by the closing of said clutch to cause said timingmotor to close said switch means after a predetermined time, meansactuable on the opening of said clutch within said time to return saiddevice to initial position, a device started by the opening of saidclutch to cause said timing motor to open said switch means after apredetermined time, and means actuable on the closing of said clutchwithin said switch opening time to return said last mentioned device toinitial osition.

9. In combination, a mac ine, a mechanism, means for driving saidmachine, means for driving said mechanism, a controller for said machinedriving means, and means acting automatically when said controller hasbeen actuated to start said machine driving means and only after saidmachine has operated continuously for a predetermined period forrenderin said mechanism driving means effective to rive said mechanism.

10. In combination, a machine, a mechanism, means for driving saidmachine, means for drivin said mechanism, a controller for said machinedriving means, and means acting automatically after said controller hasbeen actuated to stop said machine driving means and only after saidcontroller has been continuously in machine driving means stoppingcondition for a predetermined period to render said mechanism drivingmeans ineffective to drive said mechanism.

11. In combination, a machine, a mechanism, means for driving saidmachine, means for driving said mechanism, a controller for said machinedriving means, means acting automatically when said controller has beenactuated to start said machine driving means and only after said machinehas operated continuously for a predetermined period for rendering saidmechanism driving means effective to drive said mechanism, and meansacting automatically after said controller has been actuated to stopsaid machine driving means and only after said controller has beencontinuously in machine driving means stopping conditlon for apredetermined period to render said mechanism driving means ineffectiveto drive said mechanism.

7 12. In combination, a drive shaft, a driven shaft, means selectivelyoperable to couple to or uncouple said driven shaft from said driveshaft, yielding means tending to hold said driven shaft in one angularposition and free to return said driven shaft to such angular positionwhen said driven shaft is uncoupled from said drive shaft, and a deviceactuable by said driven shaft on rotation thereof away from said oneangular position to a predetermined angular extent.

13. In combination, a drive shaft, a driven shaft, means selectivelyoperable to couple to or uncouple said driven shaft from said driveshaft, yielding means tending to hold said driven shaft in one angularposition and free to return said driven shaft to such angular positionwhen said driven shaft is uncoupled from said drive shaft, a deviceactuable by said driven shaft on rotation thereof away from said oneangular position to a predetermined angular extent, and means acting torelease said driven shaft from said drive shaft after said device hasbeen so actuated.

14. In combination, a rotary drive shaft, a pulley on said drive shaft,a driven shaft, a pulley on said driven shaft, means supportin saiddriven shaft for movement to bring sai pulleys into or out of drivingrelation, means tending to hold said driven shaft out of driven relationand in a definite angular position, means actuable to move and hold saiddriven shaft in drivin relation, and a device actuable by said drivenshaft when said driven shaft has been turned by said drive shaft aredetermined angular amount.

15. In com ination, a rotary drive shaft, a pulley on said drive shaft,a driven shaft, a pulley on said driven shaft, means supporting saiddriven shaft for movement to bring said pulleys into or out of drivingrelation, means tending to hold said driven shaft out of driven relationand in a definite angular position, means actuable to move and hold saiddriven shaft in driving relation, a device actuable by said driven shaftwhen said driven shaft has been turned by said drive shaft apredetermined angular amount, and means actuable by rotation of saiddriven shaft after said device has been actuated to release said drivenshaft from driven relation to said drive shaft and permit said drivenshaft to be returned to said angular position.

16. The method which comfrises passing moist starch previously used ormolding in countercurrent flow to heated air to dry said starch,cleaning the starch so dried, and cooling the cleaned starch incondition for re-use for molding.

17. In combination, a machine, a mechanism, means for driving saidmachine, means for driving said mechanism, a controller for saidmachine-driving means, means movable from a definite initial conditionon the actuation of said controller to start said machinedriving meansand acting after a definite extent of movement from said condition torender said mechamsm-dnvmg means efiective to drive said mechanism, andmeans acting on actuation of said controller to stop saidmachine-driving mechanism prior to the completion of said extent ofmovement of said movable means to return said movable means to itsstarting condition.

18. In combination, a machine, a mechanism, means for driving saidmachine, means for driving said mechanism, a controller for saidmachine-driving means, means movable from a definite initial conditionon the actuation of said controller to stop said machinedriving meansand acting after a definite extent of movement from said condition torender said mechanism-driving means inefl'ective to drive saidmechanism, and means acting on actuation of said controller to startsaid machine-driving mechanism prior to the' completion of said extentof movement of said movable means to return said movable means toits'startin condition.

19. In com ination, a machine, a mechanism, means for driving saidmachine, means for driving said mechanism, a controller for saidmachine-driving means, lag means acting on actuationof said controllerto start or stop said machine-driving means to respectivelystart or stopsaid mechanism-driving means after a definite time interval from theactuation of said controller, and means acting on reverse actuation ofsaid controller before the expiration of .said time interval to returnsaid lag means to itsin'itial condition, whereby continuous operation orcontinuous idleness of said machine for a predetermined period isrequired in order to respectively start or stop the operation of saidmechanism.

In testimonywhereof I have aflixed my signature.

HAROLD W. HARRIGAN.

